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Study of the $$Lambda (1405)$$ in the Skyrme model, 3

Ezoe, Takashi; Hosaka, Atsushi; Maruyama, Toshiki

To determine properties of the $$Lambda (1405)$$ resonance is one of the important tasks in hadron physics. The $$Lambda (1405)$$ is well-known as a candidate of the exotic hadrons, whose properties can not be easily explained by a simple three-quark state. In our previous works, we have considered the $$bar{K}N$$ system in the Skyrme model, where baryons emerge as solitons with a finite size and baryon properties are reproduced well. We have constructed a new approach to describe kaon-nucleon systems in the Skyrme model. As a result, we have find one bound state with the binding energy of order 10 MeV, which means that the $$bar{K}N$$ bound state is realized as a hadronic molecule in our approach. In this talk, we investigate $$Lambda (1405)$$ as a $$bar{K}N$$ Feshbach resonance. The decay width of it seems to be very narrow. It means that we have succeeded in describing the $$Lambda (1405)$$ as a molecular resonance.

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